Finding the Fourth Proportional to 5,139.32, 7,092.22 and 2,781.40

Step by Step Solution

1. Step 1: Write the proportion equation
   5,139.32 : 7,092.22 = 2,781.40 : x
2. Step 2: Convert to fraction form
   5,139.32/7,092.22 = 2,781.40/x
3. Step 3: Cross multiply
   5,139.32x = 7,092.22 × 2,781.40
4. Step 4: Simplify right side
   5,139.32x = 19,726,300.71
5. Step 5: Solve for x
   x = 19,726,300.71/5,139.32
6. Step 6: Final answer
   x = 3,838.31